The Giro Feature MIPS Mountain Bike Helmet merges enhanced impact protection with low-profile, trail-savvy style. The big story with this helmet is its MIPS or Multi Impact Protection System. Originally developed by Scandinavian neurosurgeons, the MIPS system places a low-friction layer in the helmet to reduce concussion-causing rotational acceleration of the brain resulting from impacts. Ultimately, this means you'll be better equipped to come out unscathed from serious spills when you're pushing your limits on the trail. Shell Material: In-Mold polycarbonate Ventilation: 12 vents Visor: yes, adjustable Manufacturer Warranty: 1 year